I got some questions about the alternator mod. The 2007+ alternators are computer controlled. You can identify them by the two wire connector. I'm sure it's possible to hook them up to computer control, but I've not seen how and why bother? Just get a voltage regulator for a 2004 Silverado and replace the two wire voltage regulator. You'll have to do some cutting with a dremel, but no big deal. I used this guide: http://www.trifive.com/forums/showthread.php?t=116343 My 2012 motor came with a 160 amp alternator with just 5 miles on it. Useless to me with the two wire connector. But 30 minutes of work and it functions just like a normal alternator.